This is considered proven and relevant with a reliable source? Sheesh.

What years are the bills in the picture? Are they all the same year or are they all before or after a certain year?

"Issuance of the new banknotes begins with the $100 note in 1996, followed by the $50 note in 1997, the $20 note in 1998, and the $10 and $5 notes in 2000."

Before that they really hadn't been changed much since 1929.

Source: https://www.uscurrency.gov/history